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Lest start by pulling front off of thermostat and see if heat will go off.
Ok remove batteries and install them backwards for about 5 seconds.The re install correctly Se if that resets thermostat.
Remove them and put them back correctly. Should not have started smoking. Thermostat most likely has an internal short.
I understand. Most likely the thermostat has taken a power spike and the little computer board has a short. This is why heat did not shut down and display was incorrect. You will need to get another thermostat. I will be happy to recommend a replacement and guide you through installing if you want to do yourself.
Standing by for pictures
Give me a moment to look them over
That orange looking wire may just be unused and tucked back into wall. Wires sort of block letters. Tell me where each goes, For example red to R, White to W etc.
That is not an issue those frays are just moisture wicking threads to absorb and moisture that might get in the sheathing
Ok and on bottom terminals?
OK excellent Now I think your thermostat may have taken a surge or a spike. Can you get the numbers to do correctly with batteries out?
Lets try this. Press Up arrow Down arrow and Time all at the same time and see if it might reset
I you have already tried and the battery backwards made it smoke, there is most likely a short in the board.Is there anywhere like Lowes or Home Depot still open where you might pick up a new thermostat?
So anything still open,. Even Walmart should have one
All we need is a 1heat/1 cool thermostat
It is best so you don't risk shorting anything. There should be a breaker by unit inside. Otherwise just be careful not to let the blue wire touch any other wire while changing it.
No breaker or disconnect will be by the furnace .As long as we don't let blue touch anything we can leave power on
If you are going to get a thermostat I will wait up for you so we can get this fixed tonight.Just let me know.
Yes I will be here tomorrow .If that works best for you, that is fine.Just sign in to JustAnswer and go to MY Questions and that will bring you here.
Excellent .Talk to you then